Gui Jian Yu (鬼箭羽; Guǐ Jiàn Yǔ; Latin: Euonymi Ramulus; English: winged euonymus twig) is the dried winged twig of a deciduous shrub of the staff-tree family — the branch with thin corky wings around it that look like little arrow feathers, gathered in summer and autumn and dried, with a faint smell and a slightly bitter-astringent taste. It is cold, bitter, enters the Liver channel (also the Heart), and its core actions are to break the blood and unblock the menses, and to resolve toxin and disperse swelling. The usual amount is 5–10 g in a decoction, with far smaller amounts in daily teas. It is a medicinal piece, not an ordinary food — and it is never for pregnancy, because it actively moves the blood.
It is not Yi Mu Cao. Motherwort is also used for menstrual discomfort — it is slightly cold, acrid and bitter, with an even nature, leaning to invigorating the blood, regulating the menses, and draining water; this winged twig is cold and bitter, leaning to breaking stagnant blood and resolving heat-toxin. It is not a general menstrual or blood herb; it acts within clear patterns. In spleen-stomach cold deficiency — frequent abdominal pain and diarrhea — or in a clearly cold-deficient constitution, using it on your own is a poor match. Heavy or sudden bleeding, or a markedly unwell child, needs a clinic first. Do not use it yourself for a long time.
It is used most often for three patterns:
- Blood stasis blocking the menses — absent periods, painful periods, postpartum stasis abdominal pain, numb limbs, skin bruising
- Heat-toxin swellings — skin sores with swelling-toxin, red swollen painful throat, red swollen eyes
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Pregnancy, heavy periods, or spleen-stomach cold deficiency — skip it
Cold, bitter, and actively moving, it is not a daily "blood-moving tea" to keep drinking. Breaking when there is no stasis, or in a cold-deficient body, injures the yang and consumes the blood instead of helping.
When stagnant blood blocks the channels — absent periods with abdominal distension, postpartum stasis pain — or when heat-toxin shows as swollen sores, the body needs a break-and-resolve rather than a gentle hold. Gui Jian Yu is cold, bitter, and sharp. It breaks the stagnant blood, unblocks the menses, resolves the toxin, and disperses the swelling, which is why it appears in Gui Jian Yu San (Winged Euonymus Powder)–type formulas. It moves more than it holds. In pregnancy, in heavy-period bleeding, or in a cold-deficient body, more makes it worse.
Gui Jian Yu is not a catch-all menstrual or blood herb. In pregnancy, in heavy-period bleeding, in spleen-stomach cold deficiency, or without stasis and heat-toxin, using it alone is a poor match. Whether it belongs in a formula, and at what dose, should be decided by a licensed Chinese medicine practitioner after pattern diagnosis.
